JP3806846B2 - Telescopic device for bridge - Google Patents

Description

  The present invention relates to a wrap-type bridge expansion and contraction device.

  For example, as shown in FIG. 12, the wrap-type bridge expansion and contraction device has a plate 4 having fingers 40 fixedly arranged on the upper surfaces of adjacent bridge girders H and H with a gap U on one plate. 4 is configured to cover a part of the other plate 4, both plates 4, 4 move relative to each other due to temperature changes of the bridge girders H, H, and the finger 40 of one plate 4 moves to the other The plate 4 is absorbed in such a manner that it is inserted and removed between the adjacent fingers 40 of the plate 4.

  However, in the bridge extension / contraction apparatus, a large gap cannot be formed between the fingers 40 of the both plates 4 and 4 for the safety of vehicle traffic. Therefore, when the bridge girders H and H move relatively in the bridge axis direction or the direction perpendicular to the bridge axis due to an earthquake or the like, the relative movement of the bridge girders H and H cannot be sufficiently absorbed.

  Also, when the bridge girders H, H move greatly in the direction of the bridge axis or perpendicular to the bridge axis due to an earthquake or the like, the opposing plates 4 and 4 collide with each other, not only damage the fingers 40 but also other Even bridge members may be damaged. In particular, in a seismic isolation design bridge, the seismic isolation function of the bridge may be impaired. In addition, when the finger 40 is damaged, the emergency vehicle cannot pass, which causes a serious problem in the rescue operation.

  Accordingly, an object of the present invention is to provide a bridge extension / contraction device that can absorb a large amount of movement in the direction of the bridge axis or in the direction perpendicular to the bridge axis and that does not interfere with the passage of the vehicle.

  The present invention comprises plates fixed to opposite portions of one side abutment or bridge girder and the other side girder, and a plurality of either one plate in the direction perpendicular to the bridge axis so as to protrude to the other plate side. The other plate has a plurality of fingers arranged on the upper surface in a direction perpendicular to the bridge axis so that one plate covers a part of the other plate. In the bridge expansion / contraction device in which the fingers are loosely inserted between adjacent fingers of the other plate, an intermediate member for filling a part of the gap in the gap between the fingers of both plates in the other plate is provided. The intermediate member has a gap between one finger and one finger does not collide in relative movement between bridge girders due to temperature changes. It does not elastically deform on the other plate, and the bridge girders move greatly relative to each other in the direction of the bridge axis or perpendicular to the bridge due to the earthquake, and when one finger collides, it is elastically deformed on the other plate. .

  The bridge telescopic device according to the present invention can absorb a large amount of movement in the direction of the bridge axis or the direction perpendicular to the bridge axis, and does not interfere with the passage of the vehicle.

Embodiments as the best mode for carrying out the present invention will be described in detail below. (Embodiment 1)
The bridge telescopic device according to the first embodiment is arranged between bridge girders H and H having a gap U supported by a pier H ′ via a seismic isolation device M as shown in FIG. As shown in FIG. 1 and FIG. 2, plates 1 are respectively provided on the opposite portions of the bridge beams H, H, and one plate 1 has a plurality of fingers 2 arranged in a direction perpendicular to the bridge axis so as to protrude toward the other plate 1 side. And the other plate 1 has a plurality of fingers 2 arranged on the upper surface in a direction perpendicular to the bridge axis so that one plate 1 covers a part of the other plate 1 and The tip of the finger 2 is loosely inserted between the tips of adjacent fingers 2 of the other plate 1. Then, an intermediate member 3 is formed in which the gap between the fingers 1 and 2 of both plates 1 and 1 on the other plate 1 is partially compensated and deformed when the fingers 2 of the other plate 1 collide. Provided.

  The plate 1 is made of steel and is long in the direction perpendicular to the bridge axis. One plate 1 is plate-shaped and is fixed to a vertical plate 11 and a reinforcing rib 12 provided below, and the other plate 1 is plate-shaped. A horizontal portion 13 and a vertical portion 14 provided on the one plate 1 side are fixed to the reinforcing rib 12 so that one plate 1 covers the horizontal portion 13 of the other plate 1 from above, The two plates 1 and 1 are installed such that a gap is generated between the fingers 2 and 2 of the plates 1 and 1. FIG. 3 is a view showing a state before the intermediate member 3 is installed on the other plate 1. As is apparent from the figure, in this bridge expansion and contraction device, a gap larger than that of the conventional one is generated between the fingers 2 and 2.

  One plate 1 is firmly fixed to the bridge girders H and H by anchors (not shown). In this fixed state, the upper surface of the plate 1 and the upper surfaces of the bridge girders H and H are substantially flush.

  The finger 2 of the one plate 1 is formed as a part of the plate 1 and has a substantially trapezoidal shape whose width decreases in the tip direction. The finger 2 of the other plate 1 is provided on the upper surface of the plate 1 and has a triangular shape. In addition, as shown in FIGS. 4 and 5, the finger 2 is configured such that the upper surface of the finger 2 and the upper surface of the one plate 1 are substantially coincident.

  The intermediate member 3 is made of an elastic material such as rubber and has a zigzag shape so that the intermediate member 3 can be inserted into the gap between the fingers 2 and 2 of both plates 1 and 1. Thus, the upper surface and the upper surface of the one plate 1 are substantially coincided with each other. In the first embodiment, the intermediate member 3 is provided so as to contact the finger 2 of the other plate 1.

  Since the bridge telescopic device of the first embodiment is configured as described above, a situation occurs in which the bridge girders H and H move relative to each other in the direction of the bridge axis or in the direction perpendicular to the bridge axis (for example, an earthquake). When one finger 2 collides with the intermediate member 3, the intermediate member 3 is in a state where the width of the M-shaped longitudinal section is compressed.

  That is, when the bridge girders H and H are relatively moved in the direction of the bridge axis, the portion parallel to the bridge axis perpendicular direction of the zigzag intermediate member 3 is compressed, and the bridge girders H and H are relatively moved in the direction perpendicular to the bridge axis. In such a case, the oblique portion of the intermediate member 3 with respect to the direction perpendicular to the bridge axis is compressed. Thereby, the fingers 2 and 2 of both plates 1 and 1 do not directly collide with each other, the impact is reduced, and the relative movement is absorbed.

  In addition, the intermediate member 3 exists in the gap between the fingers 2 and 2 of the plates 1 and 1 and compensates for a part of the gap, so that there is no problem in passing the vehicle. In the relative movement of the bridge beams H, H caused by the temperature change, the finger 2 and the intermediate member 3 do not collide with each other.

  In other words, this bridge expansion and contraction device can secure a large gap between the fingers 2 and 2 of both plates 1 and 1, and the bridge girders H and H are relatively moved relative to either the bridge axis direction or the direction perpendicular to the bridge axis. Even in this case, the relative movement can be sufficiently absorbed without being damaged, and the vehicle can travel safely without the wheels being fitted into the gap by the intermediate member 3.

  Even if the intermediate member 3 is deformed by the collision of the fingers 2, the intermediate member 3 is restored to its original shape again without being damaged. Also, even if the intermediate member 3 is damaged, it can be easily repaired by simply replacing the damaged intermediate member 3 with a new intermediate member 3, and the entire repair work of the bridge expansion and contraction device is not required.

(Embodiment 2)
As shown in FIG. 6, the bridge telescopic device of the second embodiment has an N-shaped longitudinal section of the intermediate member 3. As described above, the intermediate member 3 is not limited to an M-shaped longitudinal section, and may be any shape that can be deformed, such as a shape in which a plurality of V-shapes are continuous, such as being compressed when the finger 2 collides. .

(Embodiment 3)
As shown in FIGS. 7 and 8, the bridge telescopic device according to the third embodiment fixes the intermediate member 3 in the gap between the fingers 1 and 2 of the plates 1 and 1 on the other plate 1 and When the situation that the bridge girders H and H move relative to each other in the direction of the bridge axis or the direction perpendicular to the bridge axis occurs due to the above, etc., the intermediate member 3 is detached when the finger 2 of one plate 1 collides with the intermediate member 3. Is.

  The intermediate member 3 is formed of steel, concrete, hard rubber or the like, and is fixed to the other plate 1 with a knock pin or the like so as not to be detached by the relative movement of the bridge girders H and H caused by vehicle traffic and temperature changes. I have to. Further, when the intermediate member 3 is detached, the intermediate member 3 is spaced from each of the fingers 2 and 2 of the plates 1 and 1 so that the intermediate member 3 can move in the bridge axis direction and the bridge axis perpendicular direction. Is to occur.

  By doing in this way, when the bridge girders H and H greatly move in the direction of the bridge axis or the direction perpendicular to the bridge axis due to an earthquake or the like, and one finger 2 collides with the intermediate member 3, the intermediate member 3 is moved onto the other plate 1. And the impact of the collision is absorbed, and both plates 1 and 1 can be relatively moved relative to each other in the direction of the bridge axis or perpendicular to the bridge axis, and the relative movement of the bridge beams H and H is absorbed. The Accordingly, the plate 1 and other bridge members are prevented from being damaged, and can be easily repaired by fixing the separated intermediate member 3 again.

  In addition, you may coat | cover the part which the finger 2 of the intermediate member 3 collides with rubber | gum. If it does in this way, generation | occurrence | production of the collision sound between fingers can be suppressed.

(Embodiment 4)
As shown in FIG. 9, the expansion device for a bridge according to the fourth embodiment is configured by fixing the intermediate member 3 in the gap between the fingers 2 and 2 of both plates 1 and 1 as in the first embodiment. When the finger 2 of the plate 1 collides, the intermediate member 3 is crushed.

  The intermediate member 3 is composed of a crushing portion 30 having a vertical M-shaped section made of steel and walls 31 on both sides thereof, and the bridge beams H, H are relative to each other in the direction of the bridge axis or the direction perpendicular to the bridge axis due to an earthquake or the like. When a situation such as movement occurs and the finger 2 of one plate 1 collides with the intermediate member 3, the crushing portion 30 of the intermediate member 3 is in a state where the width of the M-shaped longitudinal section is compressed.

  The crushing portion 30 is not limited to the above-described shape, and may be any shape that can be crushed when the finger 2 collides, such as an N-shaped longitudinal section or a shape in which a plurality of V-shapes are connected.

  Thus, if the intermediate member 3 is configured to be crushed by the collision of the finger 2, it is possible to effectively absorb the impact caused by the collision of the finger 2. Therefore, the plate 1 and other bridge members are prevented from being damaged, and can be easily repaired by replacing the crushed intermediate member 3.

(Other embodiments)
In the first to fourth embodiments, the bridge telescopic device of the present invention is provided between the bridge girders, but the bridge telescopic device of the present invention may be provided between the bridge girders and the abutment.

  Further, as shown in FIG. 10, a plurality of intermediate members 3 may be provided. If it does in this way, the clearance gap between the fingers 2 and 2 of both plates 1 and 1 can be enlarged further. As shown in FIG. 11, intermediate members 3 and 3 may be provided so as to abut against the fingers 2 and 2 of both plates 1 and 1, respectively. Further, when the finger 2 of one plate 1 collides with the intermediate member 3, the intermediate member 3 may be deformed or crushed and may be detached.

Sectional drawing which shows the state in which the expansion-contraction apparatus for bridges of Embodiment 1 of this invention is installed between the bridge girders supported by the bridge pier via the seismic isolation apparatus. The perspective view of the said expansion-contraction apparatus for bridges. Sectional drawing which shows the state before installing the intermediate member of the said expansion-contraction apparatus for bridges. XX sectional drawing of FIG. YY sectional drawing of FIG. Sectional drawing of the expansion-contraction apparatus for bridges of Embodiment 2 of this invention. Sectional drawing which shows the state in which the expansion-contraction apparatus for bridges of Embodiment 3 of this invention is installed between the bridge girders supported by the bridge pier via the seismic isolation apparatus. The perspective view of the expansion-contraction apparatus for bridges of Embodiment 4 of this invention. Sectional drawing of the expansion-contraction apparatus for bridges of Embodiment 4 of this invention. The top view which shows the case where a plurality of intermediate members are provided. The perspective view which shows the case where an intermediate member is provided in contact with each finger of both plates. The perspective view of the expansion-contraction apparatus for bridges of a prior art.

Explanation of symbols

1 plate 2 finger 3 intermediate member

Claims (1)

Fingers provided with plates fixed to opposite portions of one side abutment or bridge girder and the other side girder, and a plurality of plates arranged in a direction perpendicular to the bridge axis so that either plate protrudes to the other plate side The other plate has a plurality of fingers arranged on the upper surface in a direction perpendicular to the bridge axis so that one plate covers a part of the other plate, and the finger of one plate In the expansion and contraction device for the bridge that is loosely inserted between the adjacent fingers of the plate, an intermediate member is provided in the gap between the fingers of both plates in the other plate to compensate a part of the gap, The intermediate member has a gap between one finger and the relative movement between the bridge girders caused by temperature changes does not cause one finger to collide. The bridge girders move relative to each other in the direction of the bridge axis or the direction perpendicular to the bridge axis due to the earthquake, and when one finger collides, it is elastically deformed on the other plate. A bridge expansion and contraction device.

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